Superior structure: UNIFORM low flow resistance flow channel, rated flow coefficient adjustment is good: big adjustable range, or equal percentage flow characteristic optional linear tightness: choose soft seal, bellows seal, widely used to improve sealing performance : a variety of seat structures, fins, meet different technical parameters pressure temperature electrically-open action, the percentage of electricity-close seat structure P single-seat flow characteristics, linear adjustable range of 50: 1 seal level Ⅲ, Ⅳ, Ⅴ, Ⅵ ambient temperature of -30 ℃ ~ + 70 ℃ (Explosion-proof: -20 ℃ ~ + 60 ℃) performance standard JB / T7387-94 basic error of ± 2.5% hysteresis 1.5% off the signal valve fully open, fully closed, maintaining electrical parameters of the input signal 4 ~ 20mA DC, 0 ~ 10V DC power supply voltage AC220V50HZ; 380V.AC 50Hz 24AC / DC input impedance 250Ω output signal 4 ~ 20mA DC, 0 ~ 10V DC nominal valve parameters PN10, PN16, PN40 , PN64 flanged connections, (special: welded) Body materials WCB, SS304, SS316, SS316L Spool Material SS, SS304, SS316, SS316L, Stellite surfacing sealing material PTFE, hard seal, a special high-temperature materials Bellows SS, SS304, SS316 packing PTFE, flexible graphite putter liner rubber asbestos gaskets 2Cr13, 1Cr18Ni9Ti asbestos spiral wound gasket flange standard GB9113-88, JB / T79-94, GB2555-81 special flange ANSI, JIS, DIN C3 Group -30 ℃ ~ 150 ℃ C4 group -30 ℃ ~ 250 ℃ Fluid temperature C7 Group -30 ℃ ~ 350 ℃ C8 group -40 ℃ ~ 450 ℃ features attachment options E- explosion-proof (electrical Locator Explosion levels Optional: flameproof, intrinsically safe) Q- completely cut Diaphragm pressure solenoid valve solenoid valve http://www.qidongfa.com.cn/product/view/59.html http: // www. qidongfa.com.cn/product/view/46.html www.qidongfa.com.cn